HWH 700 Series - User Manual

Questions and Answers

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Vanessa JonesAug 18, 2025
How to troubleshoot a compressor that won't run when pressing the UP arrow on my HWH 700 Control Unit?
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  leescottAug 18, 2025
  If the compressor will not run when an UP arrow button is pushed on your HWH Control Unit, check the LED for the compressor output on the front air manifold module. The LED should be lit while pushing the UP arrow. If the compressor LED does NOT comes on while pushing an UP arrow, turn the ignition off and unplug the compressor control wire, 9700, at the module.
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daltonpatrickAug 20, 2025
What to check when no yellow level lights illuminate on my HWH 700 Control Unit touch panel?
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  Danny WilliamsAug 20, 2025
  If no touch panel yellow level lights will come on on your HWH Control Unit, check if any of the LEDs on the level sensing unit are lit.
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Brian CruzAug 22, 2025
Why are opposing level lights on, or a level light stuck on, on my HWH Control Unit?
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  Michele WatsonAug 23, 2025
  If opposing level lights are on or a touch panel level light will not go out on your HWH Control Unit, unplug the level sensing unit. If all touch panel level lights go out, the issue is the sensing unit or a short in the harness.
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Katherine WallsAug 26, 2025
What to do if the fuse keeps blowing in my HWH 700?
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  Joseph ThomasAug 26, 2025
  If the five amp fuse for +12 battery power to the latch in relay assembly of your HWH Control Unit is blown, first turn the ignition off and replace the fuse. If the fuse blows again, the problem lies on the red 6100 or red 6101 wire between the latch in relay assembly and the fuse. However, if the fuse does not blow, unplug the front MIOM and turn the ignition key on. If the fuse blows now, the issue is on the red 6102 wire between the relay assembly and the front MIOM.
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smithbryanAug 30, 2025
Why won't the DUMP light come on in my HWH 700 Control Unit?
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  Christopher StokesAug 30, 2025
  If the DUMP light on your HWH Control Unit will not come on and flash, check that whenever the ignition is in the “ON” or “ACC” position, there should be +12 volts on the black 9900 wire going to the main connector, pin C6, of the front MIOM. This is the speed switch wire. If +12 is not present, there is an issue with the transmission output, the 9900 wire, its connections to the HWH MIOM or the transmission speed switch. If +12 is present, replace the touch panel.
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Justin BrownSep 2, 2025
Why is the TRAVEL MODE light on when the ignition is off in my HWH 700?
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  Charlotte JohnsonSep 2, 2025
  If the green TRAVEL MODE light is on with the ignition off on your HWH Control Unit, the issue will be at the front air module MIOM. There is power on the red 6120 wire for pin A1 or the red 6102 wire for pin D1 of the front MIOM main connector. There should be no power on these wires with the ignition off. The 6120 wire is ignition power. The 6102 wire is battery power. If there is power on the 6120 wire there should also be power on the 6102 wire. If there is no power on the 6120 wire but there is power on the 6102 wire, the CR1 or CR2 Bosch relay is stuck on and should be replaced.
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Stuart ThorntonSep 4, 2025
What causes the compressor to run but not build pressure in my HWH 700?
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  Michael CherrySep 4, 2025
  If the compressor runs but will not build air pressure in your HWH Control Unit, make sure the compressor intake filter is not blocked. Also, the water trap has a normally open valve at the bottom, which will close whenever the compressor is running.
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Nathan Long DDSSep 6, 2025
Why does the NOT IN PARK light come on when the park brake is set in my HWH 700 Control Unit?
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  John JonesSep 7, 2025
  If the NOT IN PARK light comes on with the park brake set while pushing an UP arrow button on your HWH Control Unit, with the park brake set, there should be a ground on the black 9000 wire on pin D8 of the main MIOM plug. If there is no ground on the wire, the issue is the black 9000 wire or its connection to the vehicle park brake switch.
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Laurie MorrowSep 9, 2025
Why won't some air bags deflate on my HWH 700?
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  Angela RodriguezSep 9, 2025
  If one or more air bags do not deflate, while the other air bags do deflate on your HWH Control Unit, first, make sure the exhaust ports for the bags that will not exhaust air are not plugged with dirt or debris. Clean if necessary.
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Rebecca HolmesSep 12, 2025
What does it mean if the master warning light is on with high air pressure in my HWH 700?
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  wilsondianeSep 12, 2025
  If with 110 psi or greater in the system air tanks, the ignition on and the park brake off, the master warning light is on and the TRAVEL MODE light is off on your HWH Control Unit, unplug the system air pressure switch. There should be no continuity between the two pins of the switch plug. If there is continuity, replace the pressure switch.